Combination gas and oil burner



Nov. 8,A 1 932. R. H, FORNEX I 1,387,407

connards ens uw 1011. sumisa I Fluedgbf 3, 1930' 2 Sheetshast 1 may@ 'III' 2.77. Fak/765' Nov. 8, 1932. R. H. Forfmaxf f f 1,887,407-

A' COBINATION GAS AND OIL BURBR r Fi1edFeb-s, 1930 Y zsneets-sneet 2mama Nav. s, 1932 UNITED. srArEs yPATENT OFFICE BSB H. NBNE'Y, 0l'DALLAS, TEXAS, ASSIGNOB TO FOBNEY COHBUSTION ENGINEERING COMPANY, 0FDALLAS, TEXAS, A CORPORATION 0F TEXAS COMBNATION GAS AND OIL BURNERapplicati@ mea February 3,1930. semi 11u. 425,651.

This invention relates to new and useful im rovements in combinationburners.

ne object of the invention is to provide in a combination burner, meanswhereby one or two fuels or either of said fuels may be used withoutdisconnecting or attaching parts.

A further object of the invention is to provide a burner nozzle adaptedto burnl uel fluids of different characteristics, such as gas and oil.

Another object of the invention is to provide a burner wherein one ofthe fuels is atomized by steam and mixed therewith prior to dischar e,to form a combustible mixture; while t e other fuel is discharged underits natural pressure.

A further object of the invention is to provide a combination burner.wherein the burner elements are cooled by the fluids fiowingtherethrough.

A still further object of the invention is to Eerovide a combinationburner ti which may readily cleaned, changed or a justed withoutaffecting the o eration of the boiler.

A construction esigned to carry out the invention will be hereinafterdescribed together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanying drawin inwhichan example of the invention is s own, and wherein:

Figure 1 is a partial vertical sectional view of a furnace equippedwith" ay burner constructed in accordance with the invention,

Figure 2 is a front elevation of the same,

Figure 3 is an enlarged longitudinal sectiona view `of the burner,

Figure 4 is a partial view ofthe same partly in plan and partly insection,

Figure 5 is a front elevation of the burner tip, and

'Figure 6 is a longitudinal sectional view of a modified form of theburner tip.

In the drawings the numeral 10 designates a metal barrel, cylindrical atits rear or outer end and Vfrusto-conical at its inner or front endlfrom which the flame is projected. The barrel is designed to beembedded in the fire opening C of the furnace wall A withits rear endand its front end terminating within the wall. The frusto-conicalportion ofl the barrel causes a concentration of the currents andthesevare discharged through a bell or outwardly flared lip l11 at thefront end against the outer face of the furnace wall A so as' to coverand extend above the fire opening C. This box may be of any suitablecon# struction. A transverse draft opening 13 is provided in the frontwall at the bottom of the box below the fire opening C. A damper ordraft door 14 is hinged to the top of the opening and is supported by achain 15 adjustably engaged with a hook 16, whereby the damper may besuspended at different' heights to control ,the draft.

' An elongated collar 17 is mounted in the front wall of the boxv 12 andhas a radial flange 18 secured to the face of said wall.

-The lcollar extends on both sides of the said front wall and carries aset screw 20. An elongated tubular guide or support 19 has a` slidingfit in the collar and is fastened by the set screw 20 carried in theouter projection of the collar. The extension of the guide into vtheopening C and barrel 10 may be regulated as desired.

On the inner end of the guide is mounted a defiec'tor 2l which includesa collar 22 encircling the end of'said guide, and fastened thereon by aset screw 23. The collar has a reduced extension 24 having air openings25.

A fiared spreader 26 is carried by the extension. The spreader has upsetVvanes27 bent toward the front side-thereof and these act to admit airtangentially and impart a whirling or circular motion thereto, wherebycom-4 bustion is promoted and a more intense flame is produced.

lCC

A burner including a gas tube 28, an oil tube 29, a steam tube and tip31, is mounted coaxially in the guide 19. The gas tube 28 has a-snug fitin the guide; while' the oil tube 29 .is considerably less in diameterthan the gas tube, and the steam tube 30 is smaller than the oil tube.The tip 31 has a reduced screw threaded shank 32 which screws into theinner end of the as tube, the outer surface of the tip being ush withthe gas tube, so as to slide through the guide. All the tubes dischargeinto the tip.

A manifold head 33 (Figure 3), is internally screw-threaded, and theouter end of the gas tube is screwed into the same. Theshead has achamber 34 and an internally screwthreaded collar 35 at one sidereceiving a union 36 connected to a as supply pipe 37. Thus gas or otherfuel ows from the pipe 37 into the chamber 34 and thence to the tube 28.v

Aboss 38 in the chamber 34 is tapped to receive the outer end of the oiltube 29 and has a chamber 39 communicating with. a passage 40 extendingat right angles to the tube through the boss and the head. The nippleAof a union 41 is screwed into said passage and an oil supply pipe 42 isconnected t0 said union.

The steam tube 30 extends through the chamber 39 and has its outer endscrewed into a partition 43 separating the chamber 39 from a chamber 44.The nipple of a union 45 screws into a passage 46 into the chamber 44.`The union is connected to a steam supply pipe 47. A yoke 48 held on theouter end` of the guide sleeve 19 by a set screw 49 has an eye 50 at oneside receiving the gas pipe 37 (Figures 1 and 4). The pipes 42 and 47are carried in the side of the yoke. By this means the head and guideare held in fixed relation to each other.

As is shown in Figures 1 and 2, the gas pipe is connected with anupright gas hose 51, by an elbow 52. The hose 51 is connected to acut-ofi' valve 53 which controls the supply from the gas main. A hose.42 extends up from the pipe 42 to an oil valve 54, while a hose 47extends from the pipe 47 to a steam valve 55. By means of the valves thesupply of steam, gas and oil may be controlled or cut off.

Referring to Figure 3 it will be noted .that the tip 31 as afrusto-conical head or noz- ,zle 56 provided with inner and outercircular rows of ports 57 and 58 respectively, in-

clined radially of the tip. A mixing sleeve 59 screwed into the end ofthe oil tube 29 abuts the inner`wall of the nozzle and separates theports 57 from the ports 58. `'The sleeve receives a conical spreaderboss 60 disposed axially of the nozzle and sleeve, and the end of thesleeve has an. inward bevel 61 co-acting` with boss to delect and spreadthe 5. into theports 57.

The tube 29 is concentrically supv orted in the gas tube 28 by lugs 62,where y the sleeve-1s held in place. The sleeve has a reduced shank 63extending into the oil tube and provided with inlet ports 64. The shankbeing less in diameter than the inner diameter of the tube, oil willreadily flow along the shank, and through the ports into the sleeve.

A steam nozzle 65 screwed into the end of the steam tube 30 has an axialduct 66 discharging into a ilared nipple 67 telescoping the shank 63.Steam fiowing throughthe conductors 47 47, 46.l and 44, and the tube 30is discharged from the nozzle 65 at a relatively high velocity, andreadily expands in the mixlng sleeve 59. The oil flowing through theconductors 42', 42 41, 40 and 39, and tube 29 is discharged through theports 64 and atomized by the steam, thus eing mixed with the latter.

The oil and steam mixture is dischar ed through the ports 57 in numerousjets. as flowing through the conductors, 51, 52, 37, 36 and 34, and tube28 is received in the tip 31 and discharged in a multiplicity of jetsthrough the ports 58. The fiuid jets are ejected in more or lessconcentric or coaxial conical zones. Air is admitted to the delector 21through the openings 25 and around the Vanes27.

The deflector 21 is located in the barrel 10 in advance of the reducedend thereof, so that the gaseous currents', resulting from the admixtureof air and as, are deflected by the spreader 26, and di bell-11. Thedraft currents are concentrated in the reduced end of the` barrel andmixed with the gaseous currents projected from the burner nozzle 56,thus causing the flame to spread through the bell 11, and frusto-con`ical port B into the fire box. This results in a maximum combustion andahot llame of high heat potentiality.

The fuel and steam tubes being contained in the tubularguide19 whichcarries the deflector 21 combine therewith to form a unit.. By looseningthe screw 20, the unit may be adjusted longitudinally and thus movedinward or outward in the barrel 10. This arrangement assures the `bestresults according to the fuel mixture used. 4

While it is possible to use both gas and oil at the same time, moresatisfactory results will be had where one or the other is usedindividually. Where oil is used steam is an advantageous adjunct, butwith gas, steam, would not benecessary. The valves 53, 54 and 55 permita ready selection of fuels. Should it be desired to employ gas alone thevalves 54 and 55 may be closed. Gas flowing ,through the tube 28 ,-Willbe discharged through thev ports 58 and admixtured with a1r.

`By c1 'Y the-valve 53 and'opening the rected through the atomize theoil from the ports 64 and form a gaseous mixture in the said sleeve,which mixture will be discharged through the ports 57. The tip 31 may bereadily removed for cleaning and likewise the sleeve 59 andthe nozzle65.

`In Figure 6 I have shown a modified form of burner tip. It happensunder some conditions that the unequal expansion of the sleeve 59 andthe nozzle 56 causes a separation, whereby the oil leaks onto the top 31and finds its way back into the tube 28'and eventually to the gas main.In said figure the tip 31 has a reduced shank 32 screwed into the end ofthe tube 28 and a frustoconical head l56. The steam nozzle 65 fits 4intothe reduced shank 63 of a mixing sleeve 59 having ports 64 like thesleeve 59.

The. sleeve 59 telescopes into the cylindrical stem of an oil nozzle 71which has a snug fit in the head 56. The head has ports 58', while thenozzle has ports 57. The sleeve has an annular flange 72 engaging .theend of the oil'tube 29 onto which the stem is screwed. The sleeveterminates short of the nozzle 71 and its spreader boss 60. By thisarrangement the sleeve may elongate under expansion without injuring thetip or causing oil to leak into the gas conductor.

Various changes in the size and shape of the different partspas well asmodifications and alternations may be made within thei scope of theappended claims.

What I claim,.is:

1. In a combination burner, a steam conductor, a pair of fuel conductorsarranged one within the other, all of said conductors being coaxiallydisposed, i each conductor having an individual inlet, and a burner tipconnected with the fuel conductors and having separate dischargeoutletstherefrom for each fuel conductor.

2. The combination set forth in claim 1` with a nozzle extending fromthe steam conf tip having ports Vcommunicating with said tube, said tubehaving ports communicating Awith the inner fuel conductor, a steamconductor within the inner fuel conductor, and

a nozzle extending from the steam conductor into the mixing tube inadvance of the ports thereof for atomizing fuel discharged fr om saidinner ,fuel conductor and for mlxlng with said fuel in said tube.

. 4. A burner ti for a combination burner i comprising a cylindricalshell having a frusv to-conical head, and a mixing sleeve within theshell, the head having outer discharge ports extendn from the shell' andinner ports' separate from the shell and extending from the sleeve.

5. In a combinationburner a fuel tube,

means within the fuel tube for conducting' another fuel and steamthrough the fuel tube but separately from the first named fuel, and aburner element connected with the tube and said means and having al setof discharge ports for the fuel tube and a separate set'of dischargelports for the steam and fuel conducting means, the ports beingdivergent to spread the fuels'.

6.1The combination set forth in claim 5 with a support for the fueltube, and a deflector carried by the support and surrounding the burnerelement.

7. In a' combination burner, a fuel tube, means for conducting a secondfuel and steam through the tube separately from the fuel thereof, burnermeans; including ports for discharging the first fuel from the tube andalso burner means, including ports for discharging the steam and secondfuel sepa-v rately from the first fuel, one set of ports sur` roundingthe other.

8. The combination vset forth in claim 7 with a support for the fueltube, and a deflector carried by the support and surrounding the burnermeans.

9. A burner tip for combination burners comprising a shell havingdischarge ports, 'a nozzle separately inserted in the shell of thetipand having discharge ports separate from the ports of the shell, amixing sleeve fitting in the stem of the nozzle, the sleeve having fuelinlet ports, and a steam nozzle extending into the sleeve..

10.` In a combination burner, a plurality of fuel conductingtubesarranged one within the other, and a burner tip connected to theadjacent ends of said tubes and receiving fuel therefrom, said tiphaving divergent discharge ports, some of said ports being separatelyconnected to one fuel conductor and the other of said portsbeingseparately connected to the other conductor, whereby said fuels aredischarged in separate daring formations.

11. A combination burner as set forth in claim 10, and a spreader fordiverting one of the fuels to its ports.

12. A combination burner as set forth in claim 10, land means forsupplying and mixing steam with the fuel in one of said conductors.

13. A combination burner as set forth in claim 10, and means for mixingsteam wi h one of the fuels prior to the discharge of said fuel throughits outlets.

14. A combination burner as set forth in claim 10 in which the centralportion of the tip containing one set of ports 1s separate from theremainder of the tip and the other set of ports to permit expansion andcontraction.

l5. A. combination burner as set forth in claim l in which one of thedischarge outlets 6 of the tip is arranged in a separate movable portionfrom the other discharge outlet for permittingV expansion andcontraction of the conductor connected thereto. Y In testimony whereof Iaix my signature. 10 ROSS H. FORNEY..

